FOnline not a shooter? Gray, you made a great joke! PK, Grid camping, TC and hunting is done by shooting...
Humor, I hope? I was talking about first-person shooters. Even "7.62" - the most detailed squad combat simulator I ever saw - do not have such a feature.
Back to topic: I think some modern (REALLY modern) games have it. Some of them are strategy games (I think Dawn of War 2: Warhammer 40k had this feature, however, I'm not sure)
Definitely not.
I just want you to comprehend the scale of work. Almost each type of weapon has at least three different clip types.
Rifles: classic (assault, FAL, etc), bull-pup (XL70E3, all shotguns), front loading (G11)
SMGs: classic (M3A1, tommy, 10 mm) and bull-pup (P90)
Pistols: drum (all revolvers, 10 mm, .223), rifle-type (mauser, gauss, 14mm), handle clip (eagle), upside loading (needler)
Heavy: valving tank (flamers), ammo box (M60), rifle-type (bozar), bull-pup (LSW), backside loading (RL), cartridge belt (miniguns), unknown!!! (vindicator)
Each type has unique holstering pose => different animation. It's 16 different animations just for 2-sec action.